Lennox MLA Series

INSTALLATION/USER
INSTRUCTIONS
©
2020 Lennox Industries Inc.
Dallas, Texas, USA
THIS MANUAL MUST BE LEFT WITH THE OWNER
FOR FUTURE REFERENCE
WARNING
Improper installation, adjustment, alteration, ser vice or
maintenance can cause property damage, personal
injury or loss of life.
Installation and service must be performed by a li censed
professional HVAC installer (or equivalent) or a service
agency.
General
Refer to the Product Specications bulletin (EHB) for more
product information.
These instructions are intended as a general guide and
do not supersede local or national codes in any way.
Authorities having jurisdiction should be consulted before
installation.
The MFMA Floor Mount Console unit is matched with an
outdoor heat pump unit to create a mini-split system that
uses HFC-410A refrigerant.
Use of Mini-Split System During Construction
Lennox does not recommend the use of its mini-split
systems during any phase of construction. Very low return
air temperatures, harmful vapors and operation of the unit
with clogged or misplaced lters will damage the system.
However, mini-split systems may be used for cooling of
buildings under construction, if the following conditions
are met:
• Air lter must be installed in the system and must be
maintained during construction.
• Air lter must be replaced upon construction comple-
tion.
• The indoor wall unit assembly must be thoroughly
cleaned following nal construction clean-up.
• All mini-split operating conditions must be veried ac-
cording to these installation instructions.
MLA/MPB and
MFMA Series
SINGLE-ZONE MINI-SPLIT SYSTEMS
(208/230V) --
Floor Mount Console
508048-01 7/2020
Table of Contents
General .....................................................................................1
Use of Mini-Split System During Construction..........................1
Included Parts...........................................................................2
Optional Accessories ................................................................2
Indoor / Outdoor Unit Match-Ups..............................................2
Model Number Identication .....................................................3
Typical Single-Zone System Components................................4
System Dimensions ..................................................................5
Outdoor Units .................................................................................... 5
Indoor Units.......................................................................................5
System Clearances ..................................................................6
Outdoor Unit......................................................................................6
Indoor Unit ........................................................................................ 6
Torque Requirements for Caps and Fasteners.........................7
Indoor Unit Installation ..............................................................7
Unit Placement Considerations......................................................... 7
Floor Installation................................................................................ 7
Indoor Unit Condensate Piping Connections .................................... 8
Outdoor Unit Installation ...........................................................8
Placement Considerations ................................................................ 8
Direct Sunlight, Rain, Snow and Ice Protection ................................ 8
Prevailing Winds ...............................................................................9
Buried Refrigerant Pipe Protection ................................................. 10
Outdoor Unit Condensate Piping .................................................... 10
Securing the Outdoor Unit .............................................................. 10
Refrigerant Piping Connections .............................................. 11
Leak Test and Evacuation ......................................................13
Leak Test ........................................................................................ 13
Triple Evacuation Procedure ........................................................... 13
Wiring Connections ................................................................14
Outdoor Unit ...................................................................................14
Indoor Unit ...................................................................................... 14
Unit Start-Up ...........................................................................17
Adding Refrigerant for Longer Line Set ..................................17
Troubleshooting ......................................................................17
Test Run .................................................................................17
Pre-Checks ..................................................................................... 17
Procedure ....................................................................................... 17
Dry Mode Operation (Dehumidication) .................................18
Procedure ....................................................................................... 18
Sequence of Operation ................................................................... 18
User Guide .............................................................................18
Default Settings...............................................................................18
Auto-Restart .................................................................................... 18
Louver Angle Memory Function ...................................................... 18
Refrigerant Leak Detection System ................................................ 18
Manual Operations.......................................................................... 18
Adjusting Airow Direction .............................................................. 19
Adjust the Air Flow Direction Left and Right ................................... 19
How to Clean the Air Filter .............................................................. 19
Error Codes..................................................................................... 19
Optional Programmable Wired Controller...............................20
Programmable ................................................................................ 20
Non-Programmable......................................................................... 20

Lennox MLA Series Specifications

General

Brand	Lennox
Model	MLA Series
Category	Air Conditioner
Language	English

Summary

General Installation Overview

Use of Mini-Split System During Construction

Guidance on operating mini-split systems during construction phases to prevent damage.

Included Parts and Accessories

Optional Accessories

List of optional components available for the system.

Indoor Outdoor Unit Match-Ups

Information on compatible indoor and outdoor unit combinations.

Model Number Identification

Typical Single-Zone System Components

System Dimensions

System Clearances

Torque Requirements for Caps and Fasteners

Indoor Unit Installation

Unit Placement Considerations

Guidelines for selecting the optimal location for the indoor unit, avoiding hazards.

Floor Installation

Instructions for mounting the indoor unit on the floor, ensuring stability and clearances.

Indoor Unit Condensate Piping Connections

Outdoor Unit Installation

Placement Considerations

Factors to consider when positioning the outdoor unit to avoid noise and environmental issues.

Direct Sunlight, Rain, Snow and Ice Protection

Recommendations for protecting the outdoor unit from direct sun, rain, snow, and ice.

Prevailing Winds Protection

Buried Refrigerant Pipe Protection

Securing the Outdoor Unit

Slab or Roof Mounting

Guidelines for securing the outdoor unit onto a slab or roof structure.

Refrigerant Piping Connections

Making Connections (Male to Female Connection)

Step-by-step guide for connecting refrigerant lines using flare fittings.

Flare Nut Torque Recommendations

Specifications for tightening flare nuts to ensure leak-free refrigerant connections.

Leak Test and Evacuation

Leak Test Procedure

Procedure for testing the refrigerant system for leaks using nitrogen.

Triple Evacuation Procedure

Multi-stage process to evacuate the system to the required vacuum level.

Wiring Connections

Outdoor Unit Wiring

Instructions for making electrical connections to the outdoor unit.

Indoor Unit Wiring

Instructions for making electrical connections to the indoor unit.

Single Zone Installation Wiring Requirements

Function of Switches

Auto-Restart Function Setup

How to configure the auto-restart function using DIP switches.

Down Louver Setting

How to set the down louver position using DIP switches.

Unit Start-Up

Adding Refrigerant for Longer Line Set

Troubleshooting

Test Run

Procedure for performing a test run to verify system functionality.

Dry Mode Operation (Dehumidification)

User Guide Features

Default Settings

Describes the system's default settings after a power failure.

Auto-Restart

Explains how the system restarts after a power interruption.

Louver Angle Memory Function

Details the function that remembers the louver position.

Refrigerant Leak Detection System

How the system indicates a refrigerant leak.

Manual Operations

How to operate the unit using the indoor unit's control panel.

Adjusting Airflow Direction

How to Clean the Air Filter

Error Codes

Optional Programmable Wired Controller

Programmable Controller Connection

Instructions for connecting the programmable wired controller.

Non-Programmable Controller Compatibility

Information on the incompatibility with a non-programmable wired controller.